Improved Cycle Performance of LiNi0.8Co0.1Mn0.1O2 Positive Electrode Material in Highly Concentrated LiBF4/DMC
Improved Cycle Performance of LiNi0.8Co0.1Mn0.1O2 Positive Electrode Material in Highly Concentrated LiBF4/DMC
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DOI：
10.1149/2.0291902jes
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发表时间：
2019-01-05
影响因子：
3.9
通讯作者：
Inaba, Minoru
中科院分区：
文献类型：
--
作者：
Cao, Ziyang;Hashinokuchi, Michihiro;Inaba, Minoru
研究了高浓度四氟硼酸锂(LiBF4)/碳酸二甲酯(DMC)电解液中富镍LiNi0.8Co0.1Mn0.1O2正极材料的充放电特性。拉曼光谱表明，几乎所有的DMC溶剂分子都与Li+离子配位，BF4-阴离子可能与Li+离子和DMC形成聚集体(AGGS)。使用接近饱和的8.67mol kg(-1)LiBF4/DMC制成的LiNi0.8Co0.1Mn0.1O2竖条锂半电池在C/10倍率下循环50次，容量保持率为93.3%。此外，横截面扫描电子显微镜和EDX图谱表明，高浓度电解液不仅有效地抑制了电解液在颗粒表面的氧化分解，而且还有效地抑制了由裂纹扩展引起的颗粒断裂。(三)2019年电化学会。
Charge/discharge characteristics of nickel-rich LiNi0.8Co0.1Mn0.1O2 cathode was investigated in highly concentrated lithium tetrafluroborate (LiBF4)/dimethylcarbonate (DMC) electrolytes with better electrochemical stability against oxidation. Raman spectra indicated that almost all DMC solvent molecules coordinated Li+ ions, and BF4- anions were likely to form aggregates (AGGs) with Li+ ions and DMC in the nearly saturated 8.67 mol kg(-1) electrolyte. A LiNi0.8Co0.1Mn0.1O2 vertical bar Li half-cell using the nearly saturated 8.67 mol kg(-1) LiBF4/DMC showed a good cycle performance up to 50 cycles at C/10 rate with a capacity retention of 93.3%. Furthermore, cross-sectional SEM images and EDX mappings revealed that the highly concentrated electrolyte effectively suppressed not only oxidative decomposition of electrolyte solution on the particle surface, but also the particle fracture caused by crack propagation. (C) 2019 The Electrochemical Society.